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First, they rely on data that are more than ten years old
First, they rely on data that are more than ten years old Using the ECERS 7-point scale, the mean value of this index in their sample is 4 These studies have several limitations. If the relationships estimated in their model have changed since 1989, these estimates will differ from what we would expect to find using current data. Changes in quality made now may affect total costs in a...